Vulcanizer.



T. C. MARSHALL.

VULCANIZER. APPLICATION FILED MAR. 29. 1915.

9 l I 1 I I :1

its it:

THOMAS C. MARSHALL, OF AKRGN, OHIO, ASSIGNOR TO KELLY-SPRINGFIELD T1333.COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION GE NEW JERSEY.

VULCANIZER.

Application filed March 29, 1915.

-to the contour of the tire casin it has also been usual to employ biasfabric in the flaps, for, it will be understood, that if a straightfabric was employed in a flap cured in a straight mold or vulcanizer, inapplying the flap it would be necessary to stretch the outer edges orbuckle the center.

The object of this invention is to provide a vulcanizer for the curingof these flaps so constructed that flaps employing straight fabric maybe vulcanized therein in such a way that the flaps will properly conformto the contour or circle of the tire casings, thereby decreasing theexpense of cutting fabric on the bias and splicing it together for usein flaps cured in the straight vulcanizer.

In the accompanying drawings Figure l is a front view of a vulcanizerembodying my improvements, a portion thereof being broken away and shownin section. Fig. 2 is an end view of the same. with a portion thereofalso broken away and shown in section. Fig. 3 is an enlarged detailedsection of a portion of the main body and one of the bars,v forming themolding chamber.

Like parts are indicated by similar characters of reference in theviews.

In the said drawings, 1 represents the main body of the vulcanizer,formed on the are of a circle. This main body 1 has two interior webs 2,which are bolted to a supporting stand The body 1 is also provided withsteam chambers 4. preferably two in number, and also has a series ofgrooves or recesses 5, to form coreless molding spaces the upper portionof each of which is formed with straight sides 6 and the lower portionof which is formed curved in cross-section as indicated in detail inFig. 3.

8 represents a series of circular bars or Specification of LettersPatent.

vided with a pair of cars 11 between Patented Apr. AS, Serial No.176,827.

segments, one for each groove 5, the rear ends of which are pivoted to arod ported in brackets 10, bolted to the rea under side of the main body1.

The f 7 ward end of each one of these bars is p o is pivoted the end ofa link 12, the 0 end of the link having pivoted tbei bifur -ated end ofa clamping lever 13. cured to brackets 14, bolted to the in body 1, isalongitudinally extending b: 15, provided with a series of verticallyranged slots 16 which register with. the links12. The upper bifurcatedend of lever 13 is formed with a rounded face, i

for the purpose of engaging the under side of the bar 15 with a, tamaction to clamp the bars 8 in position.

Each of the bars 8, has its inner portion reduced so as to formshoulders 18 which engage the upper surface of the main body 1, to formstops. T he sides of each bar 8 'mmediately below the shoulders 18 areforms i straight to re ister with the straight per tions, 6, of thegrooves 5, and the inner periphery of each bar from these stra' sides isformed on the arc of a circle. a is arcof the circle forming the bottomof groove 5, is of smaller radius than of the inner periphery of the bar8 so that molding space will be widest at the center of the groove andgradually taper toward. the sides. This provides for giving the flap.the proper curvature in transverse dis rection. It is to be understoodthat these flaps are built up by fabric of several different widthswhich have been coated or frictioned with rubber and same preferablymade a little thicker than the or groove so that when the bar 8 isfirmly into place the surplus rubber is caused to flow from the heavierto the lighter part of the flap and in this way the groove or space iscompletely and irniformly filled and itwouid therefore appear that thebar 8 will. give the desired shape to the Gap, making it of crescentshape to com form to the shape of the groove. The heat from the steamcavity 4 will radi through the contact points between the bar and thebody 1 to heat the bar 8 and the I". will retain its crescent shapeafter vnieanization.

By the construction described it wi l h seen that a flap may he formedwhich wi'il conform to the circular shape of the tire caslng thusobviating the necessity of con I structing the flap with bias fabrlc,thereby reducing the expense, as, with a flap so formed, it is possibleto use the less expensive straight fabric.

Having thus described my invention I claim:

1. In a vulcanizer, a main body having a heating chamber, said mam bodybemg Y formed upon the are of a circle, a series of circular memberspivotally connected at one slde of sald mam body, said mam bodyhavingits periphery provided with a series of grooves, said circularmembers being fitted to said grooves so as to provide molding spaces,and means for clamping the free ends of said circular members to theopposite side of said main body.

2. In a vulcanlzer, a mam body formed on the arc of a circle, said mainbody being provided with a heating chamber and a lar member to engagethe periphery of said main body, the inner portion of said circularmember being fitted to said groove, the

bottom of said groove and the inner periphery of said circular memberbeing transversely formed on ferent radius.

3. In a vulcanizer, a main body formed with a receiving groove having acurved shaped bottom portion, a forming member of semi-circular formhinged at one side, means for clamping same at the opposite side, thesaid forming member having a curved shaped forming surface andsubstantially flat side projecting surfaces, the receiving groove havingsimilarfiat side surfaces, the forming member and the main body being soarranged that the flat surfaces of the forming member will contactagainst the fiat surfaces of the-receiving member and at the innermostposition of the forming member an open space will be formed between thebottoms of the two members having its widest part at substantially thecenter thereof and ending at the point where the sides of the twomemberscontact, substantially as specified. In testimony whereof, I havehereunto so my hand this 19th'day of March, 1915.

THOMAS C. MARSHALL. Witnesses M. D; TENNEY, W. F. 'Vocns.

the arcs of circles, of dif-

